Hollywood has never seen a cuter couple than Justin Long and Kate Bosworth!

Justin, 44, wrote a touching tribute for Kate’s 40th birthday on Monday.

He called her “the best part of my day, everyday” and listed all the things he loves about her.

He called her kind, grateful, deeply compassionate, and the strongest person he’s ever known.

“She’s so fun to work with. She’s the most fun to do everything with,” he went on.

He called her “purely good,” adding, “She is the most beautiful human being I’ve ever seen.”

The post garnered approval from the couple’s fans and famous friends.

Kate returned the message with her own touching tribute, thanking him for the “best birthday ever.”

“You are my love and my light, my peace and my thrill,” she wrote, thanking him for showing her what love is.